Hoist device for dumping bodies



Se t. 6 192 p 7 L. T. woon i HOIST DEVICE FOR DUMPING BODIES Filed March14. 1927 2 Sheets-Sheet l Sept. 6,1927.

l T. woon HOIST DEVICE FOR DUMPING BODIES Filed March 14. 1927 2Sheets-Sheet 2 MMQQA.

Patented Sept. 6, 1927.

LOGAN T. WOOD, 0F DETROIT, MICHIGAN.

HOIBT DEVICE FOB DUMIPING BODIES.

Application tiled March 14, 1927, Serial No. 175,119, and ln FranceNovember 2, 1926.

This invention relates to hydraulic hoisting apparatus for dumpingthecontents of bodies mounted upon trucks or similar vehicles, and isarticularly concerned with imrovements or automatically controlling thehydraulically operated piston which moves to the rear during a dumpingoperation of the body so that the piston is controlled in its movementsand moved to the rear only the necessary amount for a prescribed tiltingof the body.

In my application for patent filed of even date, I have shown aconstruction whereby the contents of the body may not onl be dumped bytilting the body about a horizontal axis at the rear end transverse ofthe frame of the truck on which the body is mounted, but it also ma bedumped by tilting the body about eit er one or two axes located one ateach side of the truck frame and parallel to thelength thereof. The samehydraulic apparatus is utilized for effecting any of the dumping oration but it is not operated as far for a si e dumping operation as itis when the contents of the body are dumped to the rear. A cylinder witha piston therein is utilized as a part of the power apparatus andaliquid pumped into the cylinder so as to move the piston to the rearwith a consequent tilting of the body about a selected axis of tilting.In the present invention it is a primary object and purpose to providean automatic mechanism which through the turning of the body for a reardumping of its contents automatically renders it ossible and necessaryto force the piston arther to the rear than when side dumping of thebody contents occurs; while 'if the selection of the dumping is on oneside of the vehiclez the hydraulic control apparatus remains 1n itsnormal position wherein the piston will only move a part of the totaldistance that it can move to the rear. Thus no attention is paid to thecontrol inasmuch as the selection of the character of dumping which isto be performed automatically takes care of this feature. For anunderstandin of the invention whereby this is attaine reference may behad to the following description taken in connection with theaccompanying drawings, in which,

Fig. 1 is a fragmentary vertlcal section taken longitudinally through atruck with a body mounted thereon, the same being equ1pped with minvention and with the body tilted for si e dumping of its contents.

Fig. 2 is a. similar section showing the bod tilted to dump its contentsat the rear of t e truck. l

Fig. 3 is a fragmentary vertical sectio taken transversely through thetruck frame and the bod mounted thereon and with the body tilted or sidedumping.

-f Figs. 4 and 5 are elevations, with parts in section, illustrating thehydraulic cylinder and piston used and the return pipes with thecontrolmechanism associated therewith, that in Fig. 4 showing the normal.position and the one that it maintains during side dumping, and Fig. 5showing it as it is changed during the rear dum ing, and

Fig. 6 is a fragmentary en arged detail in section illustrative of thevalve mechanism for controlling the stroke of the iston.

Like reference characters re er to like parts in the diierent ligures ofthe drawings.

The truck frame is of well known construction having chassis side framemembers 1 connected by cross members 2. At the rear end of the frame andtransversely thereof is a rod or shaft 3 loosely mounted in suitablebearings 4 so that it may turn about its horizontal axis. At each end ofthe rod or shaft 3, outside of the bearings, a shallow U-shaped socket 5is formed as shown in Fig. 3.

Two cam members 6 are mounted at their rear ends on the rod or shaft 3so that they may turn loosely thereon and extend forward, each at itsunder side havin an upwardly and forwardly inclined an curved surface.Said cam members are connected at their front ends by a cross bar 7which has a forward extension at its middle terminating at its front endin a cup 8 in which a ball 9 is seated. This ball is directly under thelower cam surface of a cam cross rail 10 lying between and secured atits ends to two spaced apart channel members 11 which lie above and inparallel relation to the chassis side members 1 of the truck frame. Thechannel members 11 are attached at the under side of and support aplurality of cross sills 12 on which the body of the truck is mountedand secured.

The body of the truck, made chiefiy of heavy sheet metal, has a bottom13 a front end 14, the usual pivoted tail gate 15 and two sides 16 eachof which is pivotally suspended at its upper ed e on a horizontal rod 17extending between t e front and rear ends of the body. Each of the sides16 is held in closed position by latching fingers 18 mounthd on a rockshaft 19 one of whichis carried by the truck at each side adjacent itslower edge. rll`he method of latchm or unlatching the sides of the body1s ully set forth in my application tor patent referred to.

The body, together with the cross sills l2 and the channel members 11,is supported in the sockets 5 at the ends of the rod or shalt 3 at itsrear end, and in4 similar sockets (not shown) fixed to the trame of thevehicle near the front of the body. Brackets 1iired to the channelmembers 11 carry bearing pins 2l which seat in said sockets. 'llhese pmsmay be locked in the sockets by latch members 22 which are controlled intheir movements by operating members 23 on rock shafts 24 one at theouter side oit each of the chassis trame members l. rllhe manner ofoperating the latches 22 is also fully described in my other applicationfor patent referred to. llt is enough to say that for dumping thecontents ot the body at its rear end the iront latches associated withthe front sockets are moved to inoperative position but the rear latchesassociated with the rear sockets remain in locked position.

' bers 3. Within the cylinder is a While ior dumping the body contentsat a selected side of the truck, the latches at that side remain inlocked position and those at the opposite side are unlocked.

A cylinder 25 is mounted horizontally on the cross members 2 ot thetruck frame below the body and in iront ont the cam memiston 23connected to a piston rod 27 whic extends through the rear head. of thecylinder and at its rear end is equipped with a cross head 28 on whichtwo pairs of rollers 29 and 30 are mounted. rl`he lirst rollers bearagainst the under edges of the cam members 6 while the other rollers 30bear upon rails 3l at tached to the' truck frame parallel to the lengththereof.

lt is obvious that any rear movement of the piston 26 results in anupward tilting ot cam members 6 about the anis of the rod or shaft 3. lrthe iront bearing pins 2l are unlocked trom their sockets, the body istilted upwardly about the anis of the shaft 3 and because of theengagement of the ins 21 with the sockets 5, shaft 3 is turned about itsaxis. l on the other hand the pins 2l atenel side of the body areunlocked while those at the opposite side remain locked, the cam members6 are elevated and the body is tilted to one side, as shown in Fig. 3,but the shaft 3 does not turn at all inasmuch, as shown in lFig. 2, oneof the pins 2l is seated in the socket 5 at the right hand end of shaft3 and holds it from any turning movement.

ln order to move the piston 26 to the rear liquid is pumped into thecylinder 25 at the iront through a pipe 32.` The li uid backot thepiston 23 'forced out ott e cylinder neeneee and to the pump which isused, bein carried by return pipe 33 connected with t e cylinder by twospaced apart branch pi es 3d and 35 the last of which is commonly enotedas a lay-pass pipe. When there is a tree communication ot the by-passpipe 35 with the return pipe 33, the piston 26 will move to the rearonly a point beyond where the bypass pi e connects with the cylinder orto the position shown in Fig. Il. rllhis or the reason that'as soon asthe end of the byass pipe is uncovered the yli uid will circu ate fromthe cylinder throug the pipe 35 and back to the pump through the returnpipe 33. llt on the other hand the by-pass pipe 35 is closed then thelpiston will move rearwardly until it passes by the point where the pipe3d communicates with the cylinder.

`When the body is in lower position the communication from thecylinderto the return pipe 33 through the ley-pass 35 is open.

A valve "casing 36 is used as a combination valve casing and couplingfor the sectioiis ot the return pipe and the ley-passpipe. At one sidethereof is an enlargement 37 in which a valve 38 is rotatably mounted.The valve is hollow and has direct communication with the pi e 35. llthas an opening 39 through one si e for the passage ot the liquid to thereturn pipe 33 when said opening is so positioned that it is not coveredby the wall ot the valve casing 37. The normal position ot the valve 38,when the body is in lower horizontal position, is that shown in Fig. 3.Arm 40 is connected to the valve 38 to the outer end ot which one end ofa connecting rod 41 is attached, lthe same ex,- tending to the rear andhaving attachment at its rear end to the outer end of an arm l2 which ishired to the rod or shaft 3 previously described.

llnasmuch as the rod or shaft 3 does not turn at all when side dumpingof the contents el thebody occurs the position of the passage ot theliquid in the hydraulic system through the pipe 35 to the return pipe 33so that piston 36 moves to the rear only a part of the length of thecylinder 35 or to the po-l sition shown in Fig. l. When this position isreached the cam members 3 will not be further elevated but will stay inits partially elevated position so long as the pump is operated. llt,however, the body is tilted so as to dump its contents at its rear end,the rod or shaft 3 is turned moving the arm ll2 to Mill the rear end, asa consequence, moving arm V position or thatl shown in Fig. 3 ascompared with that shown in Fig. l.

The construction described is very simple and elective for attaining thedesired objects of the invention. It is durable, practical andeiiicient, requires no attention and is fully automatic in itsoperation. The invention is defined in the appended claims and is to beconsidered comprehensive of all forms of structure coming within theirscope.

I claim:

1. In combination, a truck frame, a body located above said truck frameand tiltable about three axes, one located transversely and at the rearof the frame and the others located one at each side of and parallel tothe length of said frame, means mounted on the frame engaging againstthe bod to tilt the same in any selected direction o tilting, and meansfor limiting the extent of o eration of said tilting means when the bo yis to be tilted about either side axis and automatically increasing theextent of o ration of said tilting means when said b y is to be tiltedabout the rear transverse axis.

2. In combination, a truck frame, a bod located above the frame, ahorizontal sha mounted at the rear and transversely of said frame, saidbody at its rear end being carried by said shaft and said body beingtiltable for rear dumping of its contents about the axis of said shaftsaid body being also tiltable about two other axes one at each side ofand parallel to the length of the frame, cam members loosely mounted onsaid shaft and extendingr forward therefrom, said members at their fronthaving operative engagement with the body to tilt the same about aselected axis of tilting, a horizontal cylinder located in front of thecam members, a piston therein, a piston rod extending rearwardly fromthe piston back of said cylinder, means carried by the rear end of saidpiston rod engaging with the cam members to elevate the same on rearwardmovement of the piston, means for normally limitin the rearward movementof the piston in tlie cylinder to a part of the length of said'cylinder, and means carried by said shaft and operated thereby when thebody is tilted for rear dumping to render said piston travel limitingmeans ineffective whereby the piston will move farther to the rear insaid cylinder.

3. In combination, a truck frame, a horizontal shaft mounted on saidframe at the rear and transversely thereof, said shaft having a socketat each end, a. body carried by the frame and supported at its rear endin said sockets, said body being tiltable to dump its contents at therear end thereof about the axis of said shaft and being also tiltable todump its contents at either side turning in said sockets, hydraulicmeans for tilting the body about a selected axis of tilting, and meansattached to the shaft and operated thereby for automatically controlling-the extent of operation of said hydraulic tilting means, said shaftturning about its axis on tilting the body for rear dumping and remainmgstationary when the body is tilted to either side for side dumping ofits contents.

4. In combination, a truck frame, a shaft rotatably mounted on andlocated transversey of said frame at its rear end, a socket ormed ateach end of the shaft, a body located above and supported on said truckframe and provided with bearing pins received in said sockets, means forlocking said pins in the sockets, means for selectively freeing eitherof said bearing pins in its socket to thereby select the direction inwhich the body is to tilt, hydraulic means for tilting the body in aselected direction, means normally limiting the extent to which saidhydraulic means are operated, and means attached to said shaft andoperated thereby as the shaft turns when the body is tilted for a reardumping of its contents, to render said controlling means inoperativeand cause the hydraulic tilting means to operate to a greater extent.

5. In combination, a truck frame, a horizontal shaft rotatably mountedat the rear end and transversely of said frame, said` shaft having asocket at each end thereof, a body mounted on the frame and supportedthereby and by said sockets, bearing pins on the bod received in saidsockets, latching means or locking the bearing pins in the sockets,means for selectively releasing said latching means, cam members looselymounted on the shaft and extending forward therefrom7 means interposedbetween the front ends of the cam members and the bottom of the body fortilting the body on upward turning of the cam members about said shaft,a horizontal cylinder, a piston therein, a piston rod extending from thepiston through the rear end of the cylinder, tracks carried by theframe, a cross head at the rear end of the piston rod, rollers thereonriding on said tracks, other rollers on the cross head bearing againstthe under edges of said cam members, a pipe for conducting liquid underpressure against the front side of the piston, a second pipe connectedto the piston adjacent its rear end for returning liquid back of thepiston to the pressure means, a by-pass pipe connecting the return pipeand the cylmder at a pomt intermedlate the ends of said cylinder, avalve disposed between the by-pass pipe and the return pipe normally inopen position, and means connecting the valve with said shaft so as toturn the valve to closed position on tilting movement of the body aboutthe axis of said shaft.

6. A construction containing the elements in combination defined inclaim 5, said last mentioned means comprising an arm extendlli verselyof said frame and the others located one at each side and parallel tothe length of said frame, means for selecting the axis about which thebody shall be tilted, hydraulic means for tilting the bodyJabout aselected axis including a horizontal cylinder, a piston movablelengthwise. thereof, means connected to said pistonl co-operating withmeans bearing against the body for tilting the body, a pipe throughwhich liquid may be pumped into the :iront end oit the cylinder lorforcing the piston rearwardly, a second pipe connee-neen end torreturning liquid bac of said piston to the pump, a byass pi e connecting4nected with the cylinder ad'acent its rear the cylinder substantla lymi Way between .one side, and means operating to automatically closesaid valve on tilting the body about said rear horizontal axis wherebythe piston will move farther back andthe hydraulic means operate to agreater extent on tilting the body about the rear horizontal anis.

lin testimony whereof l am my signature.

LUGAN :TJ WUUD.

